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  1. #1
    -koom til doom-
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    straightening a bent fork?

    my fork is slightly bent. i can tell the right side is like half an inch further back than the left side, and it's easy to notice the unusual shape. i'm going to san francisco tomorrow morning, and was really hoping to bring this bike with me, as it's my beater singlespeed. seeing as how it's my beater, i really don't care how professionally done this is, i just want something that i'll be able to ride on. any recommendations on how to quickly fix this?

    if there isn't an amateur way to do this, how much do shops normally charge to fix this sort of thing? any places in san francisco you can recommend which will do this for cheap (and quick?)

    thank you.

  2. #2
    cab horn
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    If it's not steel you're screwed.

  3. #3
    -koom til doom-
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    it's steel.

  4. #4
    old codger icithecat's Avatar
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    if there isn't an amateur way to do this..........

    The official warrenty department recomends;
    1. Pull up to the corner of a concrete building.
    2. Whack the S* out of the front wheel against the building until it straightens out.
    3. Grin and ride away.

    Disclaimer. It is your face at risk, not mine.

  5. #5
    Wood Licker Maelstrom's Avatar
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    Definately a mech issue. Moved.

    Maelstrom
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  6. #6
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    Regardless of badly it's bent, I wouldn't recomend cold settingit back to position. Also depends greatly on where on the blade the bend is. I would get a new fork. Seeing as it's your beater you could probably get away with spending very little dollars, even check the used bike shops in your area.

  7. #7
    The King of Town manboy's Avatar
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    I dunno. I've fixed steel frames with a mallet and a chunk of wood. If you can find a table-mounted vise, I'd try to bend or whack it back into shape. In other words, put the crown in the vise with the blades facing up. If you've got to buy a new fork otherwise, what have you got to lose?

  8. #8
    Senior Member
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    Yeah, just take the front wheel off and stick a 2x4 or whatever in there, get a helper to hold the handlebars and twist it slowly back into position. If it's just twisted, you should be able to fix it. But if both sides are bent backwards don't waste your time.

  9. #9
    Member Sydney_A_Muppet's Avatar
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    There are fork alignment tools for this exact problem. They are called "dropout alignment tools" or something to that effect.

    Primitive, accurate and many older and more established shops with well trained mechanics use the Campagnolo versions that cost a few hundred bucks or so.


    The concept is so simple and easy to duplicate that a wise and adept Sydney Muppet could do the exact same job using simple axle bolts and an old 2 dollar axle cut in half.

    if, when bolted to the fork dropouts, the axles don't line up in the middle, you use crude leverage tools to bend the fork blades (while cold) until the broken halves are in perfect alignment. It's not the tools so much as the skill, knowledge, judgement and expertise required to do this this well.

    this skill could be had for about 12 bucks an hour at a long time reputable shop or you could get it for for free from a common muppet like myself or from the ultimate God of Bike Forum "No Nonsense" Muppets.

    However his advice comes at a price. you will have to suffer derisive comments meant to belittle you and make you feel as though you are wasting his time.

    If you are ready to submit to his particular brand of froggy insults, I will call the "Master of Muppets" for you now.......

    Sydney B. come in.... are you there Sydney B.. ????

  10. #10
    Trailmaster Pocorider's Avatar
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    Everytime you bend steel it weakens, I dont recommend bending the forks back at all. If its still ridable keep riding. If you bend it back chances are it will bend again and probably crack, then you are putting yourself at risk.

  11. #11
    MADE IN HONG KONG
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    Thank you Sydney Muppet! Esp after the Muppet Greased Taper Capper.

    Hey! Here's an idea, why rebend the trailing leg? Bending things forward and backwards will weaken the metal. One quick cold set in some cases will strengthen the metal! Therefore, bend the leading fork leg backwards! Then both legs (prongs?) will be equal in strength and will deflect the same amount under load! NO BUMP STEERING!!!! And the reduced trail and shorter wheel base will make for quicker steering and a dodger of Dodges you will be . And be you will, the envy of your friends
    If you are not having any fun, it's all your fault

  12. #12
    likes avocadoes
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    heh, like that info would fit here...
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    couple months back a coworker was jumped and someone ran over his bike. Mostly fine, except one fork leg was bent bad. We put it in a vise right below the bend, put a block of wood between the legs, and put a 12 foot long steel tube over the end and slowly worked it back into place. Barely scratched the chrome, and it's riding great...I'll post an update when it snaps off...

  13. #13
    Member Sydney_A_Muppet's Avatar
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    Quote Originally Posted by poopncow
    Hey! Here's an idea, why rebend the trailing leg? Bending things forward and backwards will weaken the metal. One quick cold set in some cases will strengthen the metal! Therefore, bend the leading fork leg backwards! Then both legs (prongs?) will be equal in strength and will deflect the same amount under load! NO BUMP STEERING!!!! And the reduced trail and shorter wheel base will make for quicker steering and a dodger of Dodges you will be . And be you will, the envy of your friends
    The logic is true. I love that.

  14. #14
    cab horn
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    Logic is true until you fork breaks and you do a faceplant at 40mph.

  15. #15
    Member Sydney_A_Muppet's Avatar
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    No reputable bike shop worth their liability insurance would allow an employee to rebend a fork. Maybe a light tweak on a fork dropout that wasn't parallel. Way better for the safety of customer and makes great financial sense for the customer to purchase a new fork, and pay for the labor to do it.

    Kinda like when a customer takes a fall and crashes on the helmet. Even if there is no visible damage, why take the chance ? Just get another one for safety's sake.

  16. #16
    hill hater nova's Avatar
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    Well half inch or less isnt a bend its a tweek. what id do personaly take the front wheel off. Place a scree driver shaft in the drop outs and pull on the side thats tweaked back. What will happen is one fork will move back alittle and the other foward a little. This will effectivel split the diffrences. Your steering will likly be noticably effected. You will get quicker response so youll want to take it around the block nice and slow a couple times to get use to it. Safty wise it should be fine. Nw any more than a half inch and id never mess with it not on a street bike. Old bmex heh ive fixxed forks with huge bends in the forks and crashed them off of jumps with no isues. Corse your talking tubes for the forks the size of a cannondales bottom tube hehe.

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